Which of the following compounds will not evolve H₂ gas on reaction with alkali metals ?

(a)

ethanoic acid

(b)

ethanol

(c)

phenol

(d)

none of these

A colourless solid substance (A) on heating evolved CO₂ and also gave a white residue, soluble in water. Residue also gave CO₂ when treated with dilute HCI ___________

(a)

Na₂CO₃

(b)

NaHCO₃

(c)

CaCO₃

(d)

Ca(HCO₃)₂

The general electronic configuration of alkali metals is ____________

(a)

[noble gas] ns²

(b)

[noble gas] ns¹

(c)

ns² np⁶

(d)

ns² (n-1)d^1-10

When an ideal gas undergoes unrestrained expansion, no cooling occurs because the molecules _____________

(a)

are above inversion temperature

(b)

exert no attractive forces on each other

(c)

do work equal to the loss in kinetic energy

(d)

collide without loss of energy

Equal moles of hydrogen and oxygen gases are placed in a container, with a pin-hole through which both can escape what fraction of oxygen escapes in the time required for one-half of the hydrogen to escape.

(a)

\(\frac { 3 }{ 8 } \)

(b)

\(\frac { 1 }{ 2 } \)

(c)

\(\frac { 1 }{ 8 } \)

(d)

\(\frac { 1 }{ 4 } \)

_____________ is the gas constant.

(a)

a

(b)

Vc

(c)

R

(d)

Tc

Pick out the correct relation for 1 mole of real gas.

(a)

\(\left( P+\frac { V }{ { a }^{ 2 } } \right) (V-b)=RT\)

(b)

\(P=\frac { RT }{ (V-b) } +\frac { a }{ { V }^{ 2 } } \)

(c)

\(\left( P+\frac { a }{ { V }^{ 2 } } \right) (V-b)=RT\)

(d)

\(\left( P-\frac { a }{ { V }^{ 2 } } \right) (V+b)=\frac { 1 }{ RT } \)

Statement I: At very high pressures, compressibility factor is greater than I.
Statement II: At very high pressure, 'b' can be neglected in vanderwaal's gas equation.

(a)

Both statement I and statement II are true and statement II explains statement I.

(b)

Both statement I and statement II are true but statement II does not explain statement I

(c)

Statement I is true but statement II is false.

(d)

Both the statements are false.

Which of the following pairs of gases will diffuse at the same time through a porus plug?

(a)

CO, NO₂

(b)

NO, C₂H₆

(c)

NO₂, CO₂

(d)

NH₃,PH₃

The value of Vander Waals constant "a" is maximum for __________.

(a)

helium

(b)

nitrogen

(c)

methane

(d)

ammonia

Mention the uses of plaster of paris

Beryllium halides are Covalent whereas magnesium halides are ionic why ?

What are the uses of sodium hydroxides?

Distinguish between diffusion and effusion.

Aerosol cans carry clear warning of heating of the can. Why?

Why sodium hydroxide is much more water soluble than chloride ?

Which would you expect to have a higher melting point magnesium oxide or magnesium fluoride ? Explain your reasoning.

Suggest why there is no hydrogen (H₂) in our atmosphere. Why does the moon have no atmosphere?

In the below figure, let us find the missing parameters [volume in (b) and pressure in (c)]
P₁ = 1 atm, P₂ = 2 atm, P₃ = ? atm
V₁ = 1dm³, V₂ =? dm³, V₃ = 0.25 dm³
T₁ = 298 K, T₂ = 298 K, T₃ = 298 K.

Explain Charles' law with an experimental illustration.

Discuss briefly the similarities between beryllium and aluminium.

Alkaline earth metal (A), belongs to 3rd period reacts with oxygen and nitrogen to form compound (B) and (C) respectively. It undergo metal displacement reaction with AgNO₃ solution to form compound (D).

Defined the following terms.

75 ml of gas A effuses through a pin hole in 73 seconds the same volume of SO₂ under identical conditions effuses in seconds. Calculate the molecular mass of A.